Cooper saw his Kettering side make it five games unbeaten
Kettering Town manager Mark Cooper praised two-goal hero Jean-Paul Marna's work-rate after Tuesday's 3-1 win over Altrincham in the Blue Square Premier.
The 27-year-old French striker made it four goals in five matches as the Poppies maintained their push for a play-off place.
"If he keeps scoring he stays in the team, it's as simple as that," Cooper told BBC Radio Northampton.
"And anyone who wants to play in my team has to be prepared to work hard."
"Even when conditions are not conducive to good football you have to keep going, and that's just what we did."
Kettering's five-match unbeaten run has left them 10th in the table, nine points away from the play-off places, but with between two and six games in hand over all the teams above them.
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